Counties ranked by narrowest ACA networks

ACA enrollees in Cook County, Illinois have access to 14% of local physicians, according to an Aug. 26 analysis from KFF. 

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On average, ACA enrollees nationwide had in-network access to 40% of local physicians in 2021, while 27% of practicing physicians were not a part of any ACA network.

KFF analyzed physician networks in the 30 counties with the highest ACA enrollments, which represent 34% of all ACA enrollees and 21% of the total U.S. population.

Counties ranked by average share of physicians participating in an ACA network:

Cook, Illinois: 14%

Lee, Florida: 23%

Fort Bend, Texas: 24%

San Diego, California: 24%

Orange, California: 25%

Harris, Texas: 25%

Los Angeles, California: 25%

Hillsborough, Florida: 28%

Clark, Nevada: 29%

Santa Clara, California: 29%

Riverside, California: 29%

Dallas, Texas: 29%

San Bernardino, California: 30%

Pinellas, Florida: 31%

Duval, Florida: 31%

Palm Beach, Florida: 31%

Salt Lake, Utah: 33%

Tarrant, Texas: 34%

Collin, Texas: 36%

Miami-Dade, Florida: 36%

Bexar, Texas: 37%

King, Washington: 37%

Maricopa, Arizona: 37%

Osceola, Florida: 38%

Orange, Florida: 38%

Broward, Florida: 38%

Middlesex, Massachusetts: 46%

Gwinnett, Georgia: 46%

Travis, Texas: 49%

Hidalgo, Texas: 61%

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